Halide Solid Electrolyte for High Conductivity and Safety

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Solution Overview

Problem

Existing solid electrolyte materials, such as sulfide solid electrolytes, generate hydrogen sulfide when exposed to the atmosphere, posing safety concerns and lacking high lithium ion conductivity, which is essential for efficient battery performance.

Innovation Solution

A solid electrolyte material composed of Li, Ca, Y, Sm, X (where X is F, Cl, Br, or I), with a specific molar ratio of O to Y and Sm, and H, enhancing lithium ion conductivity to 1×10−5 S/cm or more, and excluding sulfur to prevent hydrogen sulfide generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide solid electrolyte is used, then lithium ion conductivity is improved, but hydrogen sulfide is generated when exposed to atmosphere

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidhydrogen sulfide generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent removes sulfur from the electrolyte composition entirely, extracting the harmful element that causes hydrogen sulfide generation while maintaining the solid electrolyte structure with alternative elements (Li, Ca, Y, Sm, halogens F/Cl/Br/I, oxygen, and hydrogen)

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the chemical composition parameters by specifying a molar ratio of oxygen to (Y+Sm) greater than 0 and less than 0.32, and using halogens (F, Cl, Br, or I) instead of sulfur, thereby achieving high lithium ion conductivity without hydrogen sulfide generation

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If existing solid electrolyte materials are used, then battery structure is simplified, but lithium ion conductivity is insufficient

Engineering Contradiction:

Improvebattery structureVSAvoidlithium ion conductivity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent creates a composite solid electrolyte material combining multiple elements (Li, Ca, Y, Sm, halogens, oxygen, hydrogen) in specific ratios to achieve high lithium ion conductivity while maintaining the simplicity of an all-solid-state battery structure

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The material provides excellent charge and discharge characteristics for all-solid-state batteries, ensuring safety by avoiding sulfur and achieving high lithium ion conductivity, thus enhancing battery performance and safety.

Implementation Method 1

the solid electrolyte material has a high lithium ion conductivity, and the ion conductivity is, for example, 1×10−5 S/cm or more

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20230008629A1Solid electrolyte material and battery using same

Publication Date: 2023.01.12 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material of the present disclosure includes Li, Ca, Y, Sm, X, O, and H, wherein, X is at least one selected from the group consisting of F, Cl, Br, and I; and the molar ratio of O to the sum of Y and Sm is greater than 0 and less than 0.32.